A male cat 18 months old died of acute pneumothorax. Autopsy revealed the diaphragm protruding into the abdominal cavity and both lungs collapsed due to the pneumothorax. A node-like lesion about 8 mm in diameter was found in the lobus caudalis of the right lung. In it, the pleura was thickened by the deposit of serofibrinous and cellular exudates containing a number of fungal mycelia. Coagulative-necrotic foci having mycelia, hyperplasia of fibroblasts, and proliferation of mononuclear cells were observed. A few giant cells, epithelioid cells, and neutrophils were present in the lesion. There was a small hole produced in the pleura by necrosis of the parenchymal tissue. It was considered that air might have entered the right thoracic cavity by way of this hole and bronchi and then left the right lung through the mediastinum, and that acute death might have occurred by pneumothorax.
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